JP3846227B2 - Cleaning method for underground water flow equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for cleaning an underground water flow apparatus, and more particularly, to a method for cleaning an underground water flow apparatus that allows groundwater to flow after a water-stopping underground wall is constructed.
[0002]
[Prior art]
As is well known, when constructing underground structures, such as underground tunnels for subways and roads dedicated to vehicles, by the open-cut method, it is necessary to prevent the collapse of natural ground and to allow internal excavation. An underground wall with water is built.
[0003]
Various methods are available for building this type of underground wall, including the underground continuous wall method, but the underground wall constructed by the underground continuous wall method and the column wall method is also used. The wall may be left in the ground even after the main body of the underground structure is constructed.
[0004]
By the way, if the underground wall with water blocking properties is left in the ground, the groundwater flow will be interrupted, and the groundwater level will rise on the upstream side of the underground wall, and the groundwater level will decrease on the downstream side. The so-called dam-up phenomenon occurs.
[0005]
Therefore, conventionally, in order to eliminate such a dam-up phenomenon, after the formation of the underground wall, an underground water passage device has been installed in which a water passage is formed to communicate the groundwater flow blocked by the underground wall. It was.
[0006]
FIG. 3 shows an example of this type of underground water passage device. The water flow device shown in the figure is provided in an underground wall 4 formed by building a reinforcing bar 2 in a digging groove 1 and placing concrete 3 in the thickness direction of the underground wall 4. It has the water channel 5 which penetrates.
[0007]
The water passage 5 has a water collecting part 5a disposed on the natural mountain side and a water pipe 5b having one end communicating with the water collecting part 5a and extending substantially in the horizontal direction. One end of a cleaning pipe 6 extending to the ground side through the inside of the underground wall 4 is connected to the water collecting portion 5a, and the other end side of the cleaning pipe 6 is connected via an opening / closing valve A. It is connected to a cleaning tank 8 in which cleaning water 7 is accommodated.
[0008]
An open / close valve B is provided at the end of the water pipe 5b on the excavation side. The on-off valve B is installed after the inner root excavation. A branch pipe 5c extending upward is provided on the excavation side of the water pipe 5b, and an opening / closing valve C for measuring a flow rate is provided at an end of the branch pipe 5c.
[0009]
In the water flow device having such a configuration, a filter that filters solids such as earth and sand is usually used for the water collecting portion 5a. If this filter becomes clogged, the flow of the groundwater flow is hindered. The water collecting part 5a was washed.
[0010]
The water collecting part 5a is cleaned by first opening the opening / closing valve A and closing the opening / closing valves B and C. In this state, the cleaning water 7 is supplied from the cleaning tank 8 to the water collecting part 5a. Wash the filter layer with water 7, then close the on-off valve A, open the on-off valve B with the on-off valve C closed, and discharge the washed contaminated water to the outside through the water pipe 5b. .
[0011]
Such a washing operation is repeated a plurality of times, and at every predetermined number of times of washing, with the opening / closing valve B closed, the opening / closing valve C is opened, the flow rate flowing through the water pipe 5b is measured, The washing operation and the flow rate measurement were repeated until the flow rate was secured.
[0012]
However, such a conventional method for cleaning an underground water passage device has the following problems.
[0013]
[Problems to be solved by the invention]
That is, in the conventional cleaning method described above, since the opening / closing operation of the plurality of opening / closing valves A, B, and C of the water passage device is manually performed, when the installation depth of the water passage device is deep, the work of at least two people is performed. Person is required, and it takes time and cost.
[0014]
In addition, this type of water flow device is usually installed at a plurality of locations along the extending direction of the underground wall 4, but at this time, depending on the number of installations, should more workers be arranged? Alternatively, the cleaning operation is performed in a plurality of times, which further increases time and cost.
[0015]
This invention is made in view of such a conventional problem, Comprising: It is providing the washing | cleaning method of the underground water-flowing apparatus which can reduce time and cost.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a water-stopping underground wall formed to block underground water flow, and the groundwater flow blocked by the underground wall after the formation of the underground wall. In the method of cleaning an underground water passage device in which a water passage that allows communication is formed, the water passage is connected to a water collecting portion that is disposed on a natural mountain side of the underground wall, and one end is connected to the water collecting portion, A controller comprising a water conduit buried so as to penetrate the thickness direction of the underground wall, and a first electric valve interposed in the water passage, and controlling opening and closing of the first electric valve And the controller controls the opening and closing of the first electric valve so as to perform a cleaning operation by supplying cleaning water to the water collecting section when the flow rate in the water pipe becomes equal to or less than a steady water amount value. And when the flow rate in the water pipe after cleaning is equal to or greater than the steady water amount, the cleaning operation is performed. It was to allow sealed.
[0017]
According to the cleaning method of the underground water passing device configured as described above, the controller performs the cleaning operation by supplying the cleaning water to the water collecting section when the flow rate in the water pipe becomes equal to or less than the steady water amount value. In addition, when the flow rate in the water conduit after controlling the opening and closing of the first electric valve becomes equal to or higher than the steady water volume value, the cleaning operation is stopped. Can be recovered.
[0018]
The controller can supply the wash water contained in the tank to the water collecting part by controlling opening and closing of the second electric valve.
[0019]
According to this configuration, it is possible to automatically supply cleaning water.
[0020]
The flow rate in the water pipe is connected to the water pipe, the branch pipe whose discharge port is positioned above the installation depth of the water pipe, and the branch pipe opened and closed in response to a transmission signal from the controller. And measuring with a flow rate measuring unit including a third electric valve to be operated and a water level sensor that operates when the amount of water flowing down in the branch pipe is greater than or equal to the steady water amount value when the third electric valve is open. it can.
[0021]
According to this configuration, the steady water volume value is measured by the flow rate of the branch pipe that is connected to the water pipe and the discharge port is located above the installation depth of the water pipe. Judgment becomes possible.
[0022]
In addition, the controller is a flow meter installed in the water pipe or a water level meter installed in the ground, and indirectly or directly measures the flow rate in the water pipe, and the measured value is steady. The washing operation can be started in response to an input signal when the water amount is below the value.
[0023]
According to this configuration, the cleaning operation can be automatically started.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 and 2 show an embodiment of a method for cleaning an underground water passing device according to the present invention.
[0025]
The underground water flow device 10 shown in the figure is used when the water-stopping underground wall 12 is formed so as to block the underground water flow in the ground, and after the underground wall 12 is formed, The groundwater flow blocked by the underground wall 12 is communicated between the upstream side and the downstream side.
[0026]
The underground water flow device 10 of the present embodiment includes a water passage 14 that penetrates the thickness direction of the underground wall 12 substantially horizontally and that both ends face the upstream side and the downstream side of the groundwater flow, respectively. In the case of the present embodiment, the underground wall 12 is constructed by the underground continuous wall construction method. After the excavation groove 16 is excavated and the reinforcing bar 18 is built in the underground, the concrete is inserted into the excavation groove 16 in the concrete. 20 is formed.
[0027]
The water flow path 14 includes a water collecting portion 22 disposed on the ground mountain side of the underground wall 12, a hollow cylindrical water flow pipe 24 made of steel pipe or the like, and a first electric valve 26. The water collection part 22 is arrange | positioned at the natural mountain side of the underground wall 12, and the whole shape is formed in the substantially flat plate shape.
[0028]
The water collecting section 22 includes a casing 22a disposed on the underground wall 12 side and a filter layer 22b. The casing 22a is a box-shaped one having an open portion disposed on the natural mountain side, and the inside thereof is filled with a filter layer 22b.
[0029]
This water collection part 22 has a function of allowing groundwater existing at a predetermined depth in the ground to pass through only a moisture while filtering the solid content with a filter layer 22b.
[0030]
In addition, one end of a cleaning pipe 28 extending to the ground side through the inside of the underground wall 12 is connected to the water collecting portion 22, and the other end side of the cleaning pipe 28 is connected to the second electric valve. A wash water 32 is accommodated via 30 and connected to a wash tank 34 installed on the ground side.
[0031]
The water pipe 24 is a pipe body that is open at both ends, and one end side is connected to the water collecting part 22, and the other end side is connected to the ground via a flange part 25 that is fitted and fixed to the other end of the water pipe 24. It arrange | positions so that it may face substantially horizontal in the underground wall 12 so that the excavation side of the intermediate wall 12 may be faced.
[0032]
The opening on the excavation side of the water pipe 24 is closed by a plate or the like when the underground wall 12 is constructed in order to prevent the concrete 20 to be placed from entering.
[0033]
After the construction of the underground wall 12, the first electric valve 26 excavates the inner side thereof, hangs out the flange portion 25, and connects the end portion of the extension pipe 36 that is connected to the water pipe 24 to the end portion thereof. Has been placed.
[0034]
The first electric valve 26 is opened and closed in response to a control signal sent from a controller 38 (specifically, a personal computer) installed on the ground side.
[0035]
The controller 38 is electrically connected to the second electric valve 30 and a water level meter 40 that is buried in the ground and detects the level of groundwater. In the case of the present embodiment, a flow rate measuring unit 42 that measures the flow rate in the water pipe 24 is installed.
[0036]
The flow rate measuring unit 42 includes a branch pipe 42a, a third electric valve 42b, a container 42c, and a water level sensor 42d. The branch pipe 42 a is installed on the upper part of the extension pipe 36, and is connected to the water pipe 24 through the extension pipe 36.
[0037]
Further, the branch pipe 42 a is bent in a substantially L shape, and the discharge port (installation depth H <b> 2) is located above the installation depth H <b> 1 of the water pipe 24. The third electric valve 42b receives the sending signal from the controller 38 and opens / closes the branch pipe 42a.
[0038]
The container 42c is installed directly under the outlet of the branch pipe 42a, and receives water flowing down through the branch pipe 42a when the third electric valve 42b is opened. The water level sensor 42d is installed inside the container 42c and operates when the amount of water stored in the container 42a is equal to or greater than the steady water amount value. The operation signal of the water level sensor 42d is input to the controller 38.
[0039]
Adopting the flow rate measuring unit 42 having such a configuration has the following advantages, that is, the water pipe 24 is installed at the lower end side of the distribution width of the groundwater, and its installation depth H1 becomes relatively deep. When the flow rate of the water pipe 24 is directly measured, as shown in FIG. 1, the water head difference from the groundwater level H0 becomes large, and the flow rate is large and measurement is difficult.
[0040]
However, when the branch pipe 42 is provided as in this embodiment and the discharge port (installation depth H2) is positioned above the installation depth H1 of the water pipe 24 and the water amount is measured, the discharge port is moved upward. Accordingly, the difference in water head from the groundwater level H0 is reduced, and as a result, the steady flow rate value can be measured with a small amount of water.
[0041]
In the underground water passing device 10 configured as described above, during the construction of the underground wall 12, or during the root cutting excavation inside, and further during the construction work of the internal structure after the root cutting excavation, The water passage 14 prevents the groundwater from passing through the underground wall 12 and flowing downstream by closing the flange portion 25 or closing the first electric valve 26.
[0042]
When the construction is completed, the first electric valve 26 is opened to flow downstream of the groundwater to prevent the groundwater level from rising upstream of the underground wall 12. Eliminate so-called dam-up phenomenon.
[0043]
And if clogging occurs in the filter layer 24b of the water collecting part 22 during such operation, the water collecting part 22 is washed. FIG. 2 shows the procedure of this cleaning operation.
[0044]
In the procedure of the cleaning operation shown in the figure, first, it is executed in Step 1 when an unsteady state inside the underground wall 12 in the underground water passage device 10 is confirmed. Specifically, this unsteady state is a case where the flow of groundwater is hindered due to clogging of the water collecting portion 22, and this state is indirectly detected by the water level meter 40 in this embodiment. .
[0045]
That is, when the groundwater flow is inhibited, the groundwater level rises on the upstream side of the underground wall 12, and this is detected by constantly measuring this with the water level meter 40. In addition, the detection of the unsteady state may be detected directly by always measuring the flow rate of the water pipe 24 with a flow meter in addition to indirectly detecting with the water level meter 40.
[0046]
Since such a detection signal of the water level gauge 40 is input to the controller 38, the controller 38 that has received this signal next instructs the repetition of the drainage of the wash water 32 in step 2, The water collecting unit 22 and the water pipe 24 are cleaned.
[0047]
This washing operation is performed by (1). The water level sensor 42d of the flow rate measurement unit 42 is turned on so that the required water amount is measured. (2). The first electric valve 26 is closed, the second electric valve 30 is opened, and the third electric valve 42d is closed, and the cleaning water 32 is supplied from the cleaning tank 34 to the water collecting section 22.
[0048]
(3). The first electric valve 26 is opened, the second electric valve 30 is closed, the third electric valve 42d is closed, the supply of the wash water 32 is stopped, and the sewage through which the water collecting section 22 is washed is passed through the water pipe 24. It is discharged to the outside through.
[0049]
When the above washing and draining steps (2) and (3) have reached a predetermined number of times, in step 3, the first electric valve 26 is closed, the second electric valve 30 is closed, and the third electric valve 42d is opened, the flow rate is measured by the flow rate measurement unit 42, and it is determined whether or not the flow rate has reached or exceeded the steady flow rate value by the operation or non-operation of the water level sensor 42d of the flow rate measurement unit 42.
[0050]
If it is determined in step 3 that the flow rate is equal to or higher than the steady flow rate value, the cleaning operation is stopped in the next step 4, and then the normal underground water transfer is performed (step 5). On the other hand, if it is determined in step 3 that the flow rate is not equal to or higher than the steady flow rate value, the process returns to step 2 and the cleaning operation is continued.
[0051]
Now, according to the cleaning method of the underground water passing device 10 configured as described above, the controller 38 supplies cleaning water to the water collecting unit 22 when the flow rate in the water flow pipe 24 becomes equal to or less than the steady water amount value. Then, the opening and closing of the first electric valve 26 is controlled so as to perform the cleaning operation, and the cleaning operation is stopped when the flow rate in the water flow pipe 24 after the cleaning becomes equal to or higher than the steady water amount value. The part 22 can be cleaned to restore its function.
[0052]
Accordingly, the labor required for cleaning is greatly improved, the number of workers is small, and there are a plurality of water passing devices 10 for removing snow, which enables work with a small number of people, which is very economical. Become advantageous.
[0053]
In the case of the present embodiment, the controller 38 controls the opening and closing of the second electric valve 30 to supply the cleaning water 32 accommodated in the tank 34 to the water collecting section 22. 32 automatic supply becomes possible.
[0054]
Furthermore, in the case of the present embodiment, the controller 38 indirectly and constantly measures the flow rate in the water pipe 24 with the water level meter 40 installed in the ground, and this measured value is less than the steady water amount value. Since the cleaning operation is started in response to the input signal, the cleaning operation can be started automatically.
[0055]
【The invention's effect】
As described above in detail, according to the method for cleaning an underground water passing device according to the present invention, time and cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view at the time of cleaning showing an embodiment of a cleaning method for an underground water passing device according to the present invention.
FIG. 2 is a flowchart showing an example of a procedure of the cleaning method of FIG.
FIG. 3 is an explanatory view at the time of cleaning showing an embodiment of a cleaning method for a conventional underground water passing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Underground water flow equipment 12 Underground wall 14 Water flow path 22 Water collection part 24 Water flow pipe 26 1st electric valve 28 Washing pipe 30 2nd electric valve 32 Washing water 38 Controller 42 Flow measurement part

Claims (4)

Underground water flow in which a water-stopping underground wall is formed so as to block underground water flow in the ground, and after the formation of the underground wall, a water passage is formed to connect the underground water flow blocked by the underground wall. In the cleaning method of the apparatus,
The water channel is a water collecting part disposed on the ground mountain side of the underground wall, and a water pipe embedded in one end of the water collecting part and penetrating in the thickness direction of the underground wall; A first electric valve interposed in the water passage,
A controller for controlling opening and closing of the first electric valve;
The controller controls opening and closing of the first electric valve so as to perform a cleaning operation by supplying cleaning water to the water collecting section when a flow rate in the water pipe becomes equal to or less than a steady water amount value; and The cleaning method for an underground water passing device, wherein the cleaning operation is stopped when a flow rate in the water pipe after cleaning becomes equal to or greater than a steady water amount value. The said controller controls the opening and closing of a 2nd electric valve and supplies the said wash water accommodated in the tank to the said water collection part, The washing | cleaning of the underground water flow apparatus of Claim 1 characterized by the above-mentioned. Method. The flow rate in the water pipe is connected to the water pipe and is opened and closed in response to a sending signal from the controller, and a branch pipe whose discharge port is located above the installation depth of the water pipe. And measuring with a flow rate measuring unit comprising: a third electric valve to be operated; and a water level sensor that operates when the amount of water flowing down in the branch pipe is greater than or equal to the steady water amount value in the open state of the third electric valve. The method for cleaning an underground water passage device according to claim 1 or 2. The controller is a flow meter installed in the water pipe or a water level meter installed in the ground, and indirectly or directly measures the flow rate in the water pipe, and this measured value is a steady water quantity value. The method for cleaning an underground water passing device according to any one of claims 1 to 3, wherein the cleaning operation is started in response to an input signal when:

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